With the advent of summer, everyone is inevitably hot, the same LED display
is also more prone to fever, high temperature will lead to the failure probability of electronic components rapidly increased, resulting in the reliability of LED display screen decline. In order to control the internal electronic components of LED display, the temperature of the LED display in the working environment, not exceeding the specified maximum allowable temperature, the need for the LED display cooling design.
LED display module
cooling design, how to Low-cost, high-quality solution.
There are three basic ways of heat transfer: Heat conduction, convection, and radiation. Heat conduction: Gas conduction is caused by the irregular movement of gas molecules colliding with each other. The thermal conductivity of a metal conductor is mainly accomplished by the movement of free electrons. The heat conduction in the non-conductive solids is achieved by the vibration of the lattice structure.
The heat conduction mechanism of liquid is mainly dependent on the elastic wave. Convection: The heat transfer process caused by the relative displacement of each part of the fluid. Convection occurs only in fluids and is bound to be accompanied by thermal conductivity. The heat exchange process that occurs when a fluid flows through an object's surface is called convection heat transfer. Convection is called natural convection caused by the density of different parts of the hot and cold fluid.
If the movement of the fluid is caused by external forces (fans, etc.), it is called forced convection. Radiation: The process by which an object transmits its power in the form of electromagnetic waves is called thermal radiation.
Radiant energy transmits power in a vacuum and has the form of energy conversion, in which heat energy is converted into radiant energy and radiation into heat.
When choosing the heat dissipation method, the following factors should be considered: LED display's heat flux density, volume power density, total power consumption, surface area, volume, working conditions (temperature, humidity, air pressure, dust, etc.).
According to the mechanism of heat transfer, there are natural cooling, forced air cooling, direct liquid cooling, evaporative cooling, thermoelectric refrigeration, heat transfer of heat pipe and other heat dissipation methods.
Thermal design method of LED panel The heat exchange area between the heating electronic parts and the cold wind, the temperature difference between the heating electronic parts and the cold wind, directly affects the heat dissipation effect. This involves entering the LED display cabinet
air volume design, wind duct design. Ventilation piping design, as far as possible the use of direct pipeline to transport air, avoid the use of sharp bends and curved pipe. Ventilation ducts should avoid sudden expansion or sudden contraction. Expand the angle not exceeding 20 °, contraction of the cone angle is not greater than 60 °.
Ventilation duct should be sealed as far as possible, all lap should follow the direction of flow.
LED Display box design, there are several points to note: The exhaust hole shall be arranged on the upper side of the box.
The intake hole should be set on the lower side of the box, but not too low to prevent dirt and water from entering the box in the ground. The natural convection should be designed to facilitate forced convection. Air should be recycled from the upper direction of the box, and should adopt a special air inlet or exhaust hole. outdoor led signs
ooling air should be allowed to flow through the heating electronic components while preventing short circuit.
The inlet and outlet should be set up to prevent the sundries from entering the box. Design should be designed to ensure that the air inlet and exhaust port away.
Avoid repeated use of cooling air.
To ensure that the radiator groove direction parallel to the wind, the radiator tooth groove can not block the wind path. Fan installed in the system, due to structural constraints, the inlet and outlet are often subjected to a variety of blocking, the performance curve will be changed. According to the practical experience, the fan inlet and outlet best and the barrier has 40mm distance, if there is space limit, also should have at least 20mm.